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We breathe · Environmental impact
Since 2016, our mission has not changed: to make public transport more attractive, so that it wins more passengers, cars stay in the garage and our cities breathe more easily.
Request a demoOur name, our mission
Vehicles sized to actual ridership: less crowded at peak hours, more comfortable. Breathing is easier on public transport.
Every passenger who leaves the car behind means less CO₂, fewer nitrogen oxides and less fine particulate matter. Air pollution is the world's leading environmental health risk.
Heavily subsidised, public transport costs far less than driving. Passengers can breathe easier at the end of the month too.
In figures
of CO₂ avoided in 2023 on networks equipped with 2FLOW, up from 13,900 t in 2022.
cars replaced on average by a single bus, based on average occupancy rates measured by ADEME, the French environment agency.
CO₂ per passenger by electric bus rather than by car, on a 5.3 km urban trip.
CO₂ per passenger by tram rather than by car, on the same trip.
WEBREATHE estimates based on ridership measured by 2FLOW and ADEME emission factors, using conservative assumptions. Detailed method below.
Comparison
CO₂ emissions per passenger for a 5.3 km urban trip, the median home-to-work distance in cities according to INSEE, the French statistics institute.
These values assume 10 passengers per bus, the national average. Every additional passenger reduces the footprint of all the others: that is precisely where 2FLOW makes a difference.
Source: ADEME, Base Carbone 23.3 (2024); 1.43 people per car, 10 passengers per bus.
The 2FLOW virtuous circle
Every boarding and every alighting, at every door, with certified accuracy above 98%.
CARE reveals vehicle loads, peak demand and origin-destination journeys.
Fewer empty runs, extra capacity where demand calls for it, right-sized vehicles.
The API·IV publishes real-time occupancy rates in apps and on passenger information displays.
A more reliable, more comfortable service attracts new passengers, who leave their cars behind.
In the field
Three networks equipped with 2FLOW, presented anonymously. With a comparable fleet, every additional passenger dilutes vehicle emissions.
BRT line · 16 electric buses
−32%CO₂ per passenger in two years
2FLOW data justified increasing from 10 to 16 vehicles at strategic times. Ridership followed: over 1.2 million additional trips and around 500 t of CO₂ avoided through modal shift from the car.
Urban network · 18 buses
−70%emissions per passenger in three years
A network strengthened step by step on the basis of counting data: ridership more than tripled, and each trip emits three times less.
Metropolitan network · 46 buses
−56%emissions per passenger in one year
With the same fleet and mileage, ridership grew 2.3-fold: the same buses carry far more passengers.
WEBREATHE means “we breathe”. This report sets out our method, ADEME emission factors and four case studies measured by 2FLOW: what we already do for the air in our cities, and the work ahead.
Learn moreImpact investors
2FLOW data makes it possible to calculate, every year and network by network, the CO₂ effect of the measures taken by transport authorities and operators.
Over 10,000 cities committed to the Global Covenant of Mayors, around a hundred major cities in the C40 network: all of them must develop sustainable public transport.
2FLOW contributes to Sustainable Development Goals (SDGs) 3 (good health), 11 (sustainable cities and communities) and 13 (climate action).
Sensors and computers designed and manufactured in Lille, monitored and updated remotely, without taking vehicles out of service.
Our method
Boardings and alightings counted by 2FLOW, not estimates.
Additional passengers are allocated according to national modal shares: 62.8% would have driven, the others would have walked, cycled or already used public transport.
5.3 km, the median home-to-work distance in urban areas (INSEE).
CO₂, nitrogen oxide and fine particulate emissions from ADEME.
10 passengers per bus and 1.43 people per car: in reality, buses and trams are often much fuller.
The rise in ridership also reflects the networks' own choices, such as service levels or fares. 2FLOW provides the data that informs these choices and measures their effect.
Sources: ADEME, Base Carbone 23.3 (July 2024) and road transport emission factors; INSEE, median home-to-work distance; WHO, air pollution and health.
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